package com.situ.myboot.interceptor;

import com.situ.myboot.pojo.User;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class LoginInterceptor implements HandlerInterceptor {

    //返回true，代表放行，可以访问后台的资源
    //返回false，代表被这个拦截器拦截，不可以访问后台的资源
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("LoginInterceptor.preHandle");

        HttpSession session = request.getSession();
        User user = (User) session.getAttribute("user");
        if (user == null) {
            response.sendRedirect("/login/getLoginPage");
            return false;
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("LoginInterceptor.postHandle");
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("LoginInterceptor.afterCompletion");
    }
}
